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New tire 19 inch

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Old Jun 14, 2019 | 06:01 AM
  #1  
Mikael10's Avatar
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W205 c220d
New tire 19 inch

Hello,
Just got New tire on my 19 inch rim.
Front rim 8.5
Rear rim 9.5

The new tires are:
Front 235/40/19
Dear 275/30/19

Is that ok ?

I Think the front tire looks very big

Thanks
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Old Jun 14, 2019 | 09:01 AM
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CJG's Avatar
CJG
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2016 C300 4MATIC
I think it should only be 5 difference. Not 10. As in 35 and 40. Not 30 and 40.
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Old Jun 14, 2019 | 09:23 AM
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W205 c220d
The wheelshop says is it normal
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Old Jun 14, 2019 | 09:38 AM
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CJG
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2016 C300 4MATIC
Mercedes says otherwise:
  1. 225/40R19 | 93Y
  2. 255/35R19 | 96Y
If you're so sure why are you even asking?
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Old Jun 14, 2019 | 09:45 AM
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W205 c220d
Because I do not trust the shop
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Old Jun 14, 2019 | 10:05 AM
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LOL. Then why did you buy them without checking elsewhere first?
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Old Jun 14, 2019 | 10:28 AM
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Originally Posted by CJG
I think it should only be 5 difference. Not 10. As in 35 and 40. Not 30 and 40.
also an uninformed response (because that measurement is only a ratio of the width of the tire - so a staggered set-up could easily require a difference in ratio greater than 5).

Tire diameter should be within 3% of stock. You are increasing the front diameter and decreasing the rear. Both are within spec of their respective corners but from front to rear they have greater difference than that 3%

This would not only look weird as hell but could also trip internal sensors and cause issues.

What size wheels? anything 9.5 width and below - just spec a 265/35 for the rear and stay with the front at 235/40

Last edited by alexasa; Jun 14, 2019 at 10:33 AM.
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Old Jun 14, 2019 | 10:42 AM
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W205 c220d
So the wheelshop has made a mistake ?
Thanks you so much for the help

Originally Posted by alexasa
also an uninformed response (because that measurement is only a ratio of the width of the tire - so a staggered set-up could easily require a difference in ratio greater than 5).

Tire diameter should be within 3% of stock. You are increasing the front diameter and decreasing the rear. Both are within spec of their respective corners but from front to rear they have greater difference than that 3%

This would not only look weird as hell but could also trip internal sensors and cause issues.

What size wheels? anything 9.5 width and below - just spec a 265/35 for the rear and stay with the front at 235/40
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Old Jun 14, 2019 | 02:53 PM
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Originally Posted by alexasa
also an uninformed response (because that measurement is only a ratio of the width of the tire - so a staggered set-up could easily require a difference in ratio greater than 5).

Tire diameter should be within 3% of stock. You are increasing the front diameter and decreasing the rear. Both are within spec of their respective corners but from front to rear they have greater difference than that 3%

This would not only look weird as hell but could also trip internal sensors and cause issues.

What size wheels? anything 9.5 width and below - just spec a 265/35 for the rear and stay with the front at 235/40
Say what? The numbers I listed are the stock tire sizes per Mercedes. I'd say that's informed.
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